Re: nhi0: Cannot find Upstream Facing Port

On Mon, Jun 15, 2026 at 08:40:19PM -0700, Enji Cooper (yaneurabeya) wrote:
>
> > On Jun 14, 2026, at 11:19 PM, Chris Torek <[email protected]> wrote:
> >
> > Noticed that there's some new thunderbolt code. I get this during boot:
> >
> > pci3: <PCI bus> on pcib3
> > nhi0: <Generic USB4 NHI> at device 0.0 on pci3
> > nhi0: Cannot find Upstream Facing Port
> > nhi0: tb_router_attach_root()  error.  The driver should be loaded at boot
> >
> > If it helps any, here's some "pciconf -lv" output snippets:
> >
> > pcib2@pci0:1:0:0:       class=0x060400 rev=0x02 hdr=0x01 vendor=0x8086 device=0x
> > 1136 subvendor=0x8086 subdevice=0x0000
> >    vendor     = 'Intel Corporation'
> >    device     = 'Thunderbolt 4 Bridge [Maple Ridge 4C 2020]'
> >    class      = bridge
> >    subclass   = PCI-PCI
> > pcib3@pci0:2:0:0:       class=0x060400 rev=0x02 hdr=0x01 vendor=0x8086 device=0x
> > 1136 subvendor=0x8086 subdevice=0x0000
> >    vendor     = 'Intel Corporation'
> >    device     = 'Thunderbolt 4 Bridge [Maple Ridge 4C 2020]'
> >    class      = bridge
> >    subclass   = PCI-PCI
> > pcib4@pci0:2:1:0:       class=0x060400 rev=0x02 hdr=0x01 vendor=0x8086 device=0x
> > 1136 subvendor=0x8086 subdevice=0x0000
> >    vendor     = 'Intel Corporation'
> >    device     = 'Thunderbolt 4 Bridge [Maple Ridge 4C 2020]'
> >    class      = bridge
> >    subclass   = PCI-PCI
> >
> > Can include more if needed. System works fine without whatever it's
> > trying to do (of course, since it wasn't even detected before :-) )
>
> Hi Chris,
> 	I lit up the code in GENERIC in 886164895f — so that’s my fault  :) (any info about the thunderbolt devices would be appreciated!). obiwac@ asked that I back it out, so I’ll take care of that now since it’s on my mind.
> Thanks!
> -Enji
>
> PS The thunderbolt(4) device implementation is incomplete: it was based on work done by hselasky@ before he passed away back in 2023. I have a TODO item to look at trying and get it working (enough) to have functional Thunderbolt/USB4 stack for storage purposes, but it’s way down my TODO list. tl;dr: I’m trying to get a partially functional Mac x86 port before Apple nukes Intel support from macOS.


I am seeing the same error message on AMD hardware.

# pciconf -lv|rg -A4 nhi
nhi0@pci0:195:0:5:	class=0x0c0340 rev=0x00 hdr=0x00 vendor=0x1022 device=0x1668 subvendor=0xf111 subdevice=0x0006
    vendor     = 'Advanced Micro Devices, Inc. [AMD]'
    device     = 'Pink Sardine USB4/Thunderbolt NHI controller'
    class      = serial bus
    subclass   = USB
nhi1@pci0:195:0:6:	class=0x0c0340 rev=0x00 hdr=0x00 vendor=0x1022 device=0x1669 subvendor=0xf111 subdevice=0x0006
    vendor     = 'Advanced Micro Devices, Inc. [AMD]'
    device     = 'Pink Sardine USB4/Thunderbolt NHI controller'
    class      = serial bus
    subclass   = USB